}

            int ncpos = getHeaderStart() + negotiateContextOffset;

            // Validate that negotiate context data doesn't start beyond buffer
            if (ncpos < 0 || ncpos >= buffer.length) {
                throw new SMBProtocolDecodingException(
                        "Negotiate context offset points beyond buffer (offset: " + ncpos + ", buffer size: " + buffer.length + ")");
            }

	visit(f, x, context)
	switch n := x.(type) {
	case *ast.Expr:
		f.walk(*n, context, visit)

	// everything else just recurs
	default:
		error_(token.NoPos, "unexpected type %T in walk", x)
		panic("unexpected type")

	case nil:

	// These are ordered and grouped to match ../../go/ast/ast.go
	case *ast.Field:
		if len(n.Names) == 0 && context == ctxField {

    // the given node name (error_node_) and requested device (error_device_).
    for (const auto node : graph->get()->nodes()) {
      if (node->name().find(error_node_) != string::npos &&
          node->requested_device() == error_device_) {
        return tensorflow::errors::Internal("Injected graph pass error.");
      }
    }
    return absl::OkStatus();
  }

 private: